Day 5

05/01.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+points=()
+while read line; do
+  x1=$(sed 's/,.*$//' <<< $line)
+  y1=$(sed 's/^.*,\(.*\) ->.*$/\1/' <<< $line)
+  x2=$(sed 's/^.*-> \(.*\),.*$/\1/' <<< $line)
+  y2=$(sed 's/^.*,.*,//' <<< $line)
+  if [ $x1 -ne $x2 ] && [ $y1 -ne $y2 ]; then
+    continue
+  fi
+  if [ $x1 -eq $x2 ]; then
+    x_inc=0
+  elif [ $x1 -gt $x2 ]; then
+    x_inc=-1
+  else
+    x_inc=1
+  fi
+  if [ $y1 -eq $y2 ]; then
+    y_inc=0
+  elif [ $y1 -gt $y2 ]; then
+    y_inc=-1
+  else
+    y_inc=1
+  fi
+  i=$x1
+  j=$y1
+  while [ $i -ne $x2 ] || [ $j -ne $y2 ]; do
+    points+=( "$i,$j" )
+    i=$((i+x_inc))
+    j=$((j+y_inc))
+  done
+  points+=( "$i,$j" )
+done
+
+printf '%s\n' "${points[@]}" | sort | uniq -d | wc -l